| http://www.w3.org/ns/prov#value | - Use of smokeless tobacco was assessed from the questions, ???Have you ever used smokeless tobacco products such as chewing tobacco, snuf or snus???? and ???Do you currently use chewing tobacco, snuf or snus every day, some days or not at all???? Based on the responses, use of smokeless tobacco was categorized into never, former and current smokers.
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